The ‘Defective’ American Torpedo That Betrayed U.S.Submarine Crews In 1942

Today’s story is about a deadly crisis that American submarine crews faced across the Pacific in 1942.

A crisis where their primary weapon turned every perfect attack into a gamble with their own lives.

This is how the US Navy’s most promising offensive strategy nearly collapsed before it began.

The year is 1942.

Deep in the Pacific Ocean, aboard the cramped, sweltering confines of an American Godtoclass submarine, the atmosphere is electric, the skipper executes a perfect approach on a Japanese convoy.

The sonar operator calls out bearings.

The torpedo data computer spins its gyros and the order is given.

Fire one, fire two.

The boat shutters as compressed air violently ejects two tons of steel and high explosives.

The crew starts the stopwatch, tracking the silent killers on their journey.

They hear the distinctive hot, straight, and normal run.

Everything is perfect.

They anticipate the satisfying whole shaking boom of a successful hit, but it never comes.

Instead, there’s only silence, or worse, the premature, useless detonation of their own weapon far from the target.

From the Solomon Sea to the coast of Japan, this scene of maddening frustration repeated itself.

American submarine commanders were risking their lives on thousandm patrols only for their primary weapon to fail catastrophically at the moment of truth.

They reported torpedoes running harmlessly underneath enemy ships, hitting holes with a dull thud, or exploding well before reaching their mark.

The official response from the Navy’s Bureau of Ordinance was dismissive.

The torpedoes were perfect.

The failures were the fault of inexperienced skippers.

Morale plummeted.

I cru knew they were making perfect shots, yet their arsenal was useless.

They were fighting two enemies, the Japanese Navy and their own defective equipment.

Lieutenant Commander Lawson Ramage stands in the conning tower of USS Trout, his knuckles white against the periscope housing.

A fat Japanese tanker fills his view at 800 yd, so close he can see rust streaks on her hull.

The approach has been textbook perfect.

The culmination of three weeks of patient stalking.

The torpedo data computer has calculated the firing solution with mechanical precision.

Gyro angle set.

Depth set at 10 ft.

Fire three.

The deck shutters.

Fire four.

Another shutter.

The crew counts the seconds.

At this range, they expect detonation in 45 seconds.

The sonar operator’s voice crackles over the intercom.

Hot, straight, and normal.

Both fish running true.

Ramage watches through the scope as the tanker plows ahead, oblivious.

No alarm bells, no emergency turn.

She’s a sitting duck.

30 seconds, 40 seconds, 50 seconds, nothing.

The tanker steams past untouched.

Somewhere beneath her keel, two American torpedoes have passed harmlessly underneath, their depthing mechanisms having failed.

The crew hears the tanker’s propeller screws fade into the distance.

A mocking sound.

Two of their precious 24 fish are wasted and they’ve just given away their position.

Destroyer bearing 095.

Range closing fast.

The sonar operator’s voice rises.

The screening vessel heard the torpedo launches.

Flood negative.

Take her down.

Rig for depth charge.

The ordered chaos of a crash dive erupts.

The hole groans as ocean pressure builds and they drop through 200 ft above.

The first depth charges detonate, shaking the boat like a kicked can.

Light bulbs shatter and cork insulation rains from overhead.

They survive the pounding.

12 hours later they surface in darkness.

Exhausted and furious.

Ramage writes in his patrol report.

Two torpedoes fired at tanker range 800 yd.

No explosions observed.

Target unharmed.

It’s the same infuriating report being written across the Pacific.

By mid 1942, the problem revealed itself in brutal mathematical terms.

American submarines were achieving perfect firing positions, yet sinking rates remained catastrophically low.

USS Sargo fired 13 torpedoes in January 1942 for zero hits.

USS Skipjack expended eight torpedoes at a convoy with the same result.

These weren’t green skippers making mistakes.

They were experienced commanders executing flawless attacks.

The torpedoes cost $10,000 each in 1942.

Submarines were expending a fortune on weapons that ran underneath targets hit without detonating or exploded prematurely.

Japanese merchant ships, troop transports, and tankers steamed through American patrol zones with near impunity.

The entire American submarine strategy, strangling Japan’s supply lines, was failing because the weapons didn’t work.

Commander Dudley Morton of USS Wahoo illustrated the multifaceted failure in January 1943.

Hunting a four- ship convoy, he closed to 1,200 yd and fired three torpedoes.

Morton watched as the first passed directly beneath the freigher’s keel.

The second struck the hole of midshipips with a solid metallic clang audible throughout Wahoo’s control room, but no explosion.

The third torpedo detonated prematurely 200 yd short, alerting the entire convoy.

As destroyers raced toward his position, Morton crash dived, knowing his perfect shot had been betrayed by his own weapons.

Three distinct catastrophic problems plagued the torpedoes.

First was depthing.

Skippers reported torpedoes consistently running 10 to 15 ft deeper than set.

A fish set for 10 ft to hit a ship’s hull would run at 25, passing harmlessly underneath.

The torpedoes hydrostatic depth engines were in practice killing American attacks.

Some commanders tried setting them to zero depth, but this was a gamble.

The torpedoes might run shallow, leaving a visible wake or breach the surface and veer off course.

Second was the contact exploder.

Even when torpedoes hit enemy holes, they often failed to detonate.

The skippers reported hearing the metallic clang of warhead on steel, then nothing.

This wasn’t a depth problem, but a fundamental design failure in the firing mechanism.

Lieutenant Commander Howard Gilmore of USS Growler encountered this near TR in February 1943.

He fired six torpedoes at point blank range, scoring four solid hits.

The result, zero explosions.

He wasted six torpedoes and revealed his position for nothing.

The third failure was premature explosion.

Torpedoes detonated spontaneously along their run, sometimes threatening the launching submarine itself, but more often acting as a spectacular beacon for every enemy ship in visual range, triggering depth charge attacks.

Commander Richard Okaine, executive officer aboard USS Wahoo, kept meticulous records that became damning evidence.

During one patrol you of 14 torpedoes fired, nine ran deep, three were duds and two were prematures.

Zero successful detonations.

The Bureau of Ordinance in Washington refused to acknowledge the problem.

Their response to field reports was consistent and infuriating.

The torpedoes were perfect.

They had passed testing at Newport Torpedo Station.

The failures, they insisted, must result from poor seammanship, incorrect firing solutions, or cowardice.

The implication stung.

Commanders were either lying or incompetent.

This institutional denial had murderous consequences.

Commander Morton famously radioed Pearl Harbor.

Torpedoes ran under target.

Depth mechanisms faulty.

Request immediate investigation.

The response: Depth mechanisms tested and proven.

Revise attack procedures.

morale across the submarine force collapsed.

Crews endured weeks in claustrophobic, grueling conditions, the wreak of diesel and unwashed bodies, crushing humidity, and rationed water because they believed their mission mattered.

They were the tip of the spear in the Pacific.

But when their primary weapon failed and headquarters dismissed their reports as lies, the psychological damage became profound.

They were risking death by depth charge, collision, and mechanical failure.

All for weapons that didn’t work.

Japanese merchant captains began noticing the pattern.

Radio intercepts revealed their growing confidence.

American torpedoes were defective.

Convoy routes continued operating with reduced escorts as the submarine threat wasn’t materializing.

Intelligence reports confirmed the enemy knew and was exploiting the weakness.

By mid 1943, the crisis reached a breaking point.

Japan’s supply lines remained intact.

The strategy that should have been crippling Japanese logistics was failing utterly.

Not from a lack of skill or courage, but because the weapons were dysfunctional.

Desperate skippers resorted to risky tactics.

Some used deck guns in surface attacks, exposing their fragile submarines to devastating counter fire.

Others fired entire six or eight torpedo spreads, hoping sheer volume would compensate for individual failures, a practice that catastrophically depleted their ammunition.

They experimented with shallow depth settings, accepting the high risk of torpedoes breaching or being spotted.

The reliability dropped even further.

The enemy understood.

Postwar Japanese reports revealed their awareness of the problem as early as 1942.

Their merchant captains were instructed, “If you hear torpedo launches, don’t panic.

The American fish will likely run too deep or fail to explode.” This psychological reversal was devastating.

The hunted recognized the hunter’s weapons were defective and responded with calculated indifference.

Across the Pacific, in cramped control rooms, American crews faced this grinding reality.

They had mastered their boats and the complex mathematics of torpedo fire.

They had accepted the immense risks of their profession, but they could not accept that their own equipment sabotaged every attack, that headquarters denied the problem, and that Japanese merchants steamed unmolested while their torpedoes failed.

The desperate need crystallized.

They needed reliable weapons that rewarded perfect tactics with successful hits.

They needed the Bureau of Ordinance to stop defending the indefensible and fix the deadly failures that were costing American lives and losing the Pacific campaign.

The crisis could not continue.

The torpedo that emerged from the Hawaiian tests bore the same designation, but it was fundamentally transformed.

Submarine crews watched with cautious optimism as ordinance teams recalibrated the depth mechanisms on every Mark14 in the Pacific Fleet.

The work was painstaking, mechanical, adjusting the hydrostatic valve that controlled running depth, setting each weapon to run exactly where its dial indicated, not 10 ft deeper.

In cramped forward rooms, torpedo men worked through tropical nights, their hands slick with hydraulic fluid as they manually corrected what the Bureau of Ordinance had refused to fix.

The metal fish that emerged from this unauthorized modification looked identical to what had been fired uselessly for 2 years.

But the changes ran deeper than surface appearance.

These torpedoes would finally run true.

The weapon that caused such catastrophic failure was the Mark1 14 torpedo, a 20 ft 3,280lb steam turbine weapon.

Its 643lb Torpex warhead, about 50% more powerful than TNT, should have made it one of the most devastating anti-ship weapons in naval history.

Designed for a maximum range of 4,500 yd at 46 knots, the Mark1 14 was propelled by a steam turbine fed by alcohol and compressed air, leaving a relatively faint wake.

The weapon incorporated what was then state-of-the-art technology, a gyroscopic guidance system, an intricate hydrostatic depth control, and the highly complex Mark 6 magnetic influence exploder designed to detonate beneath a ship’s keel where its hull was most vulnerable.

On paper, the Mark1 14 represented American technological superiority, a weapon that could break a battleship’s back without a direct strike.

In reality, it was the product of 15 years of peacetime development conducted with inadequate live fire testing due to budget constraints.

Each torpedo cost $10,000, equivalent to nearly $200,000 today, and the Navy had authorized only two live fire tests with the magnetic exploder before the war.

Both were interpreted as successes despite ambiguous results.

This catastrophic lack of realworld validation would cost the submarine force dearly.

By October 1943, with the depth running problem corrected and the magnetic exploders deactivated, American submarines finally possessed a weapon worthy of their crews courage, the results were immediate.

On October 24th, 1943, USS Tang under commander Richard Okaine fired six corrected Mark1 14 at a convoy.

All six ran true and detonated.

Three cargo ships totaling 15,000 tons went to the bottom in 17 minutes.

Okaane described watching silver trails run at the exact depth he’d set, striking holes with the solid crack of proper contact detonations, not the muffled thump of misses or the premature flash of magnetic failures.

The explosions sent geysers of water and debris skyward as warheads punched through steel plates.

One ship carrying aviation fuel became an instant fireball.

The submarine crews faith in their primary weapon shattered through two years of failure began to rebuild.

The impact was quantifiable and dramatic.

In 1942, American submarines fired 1,442 torpedoes and sank 180 Japanese ships.

In 1944, with corrected Mark1 14S, they fired 6,92 torpedoes and sank 603 ships, a three-fold increase in the hit-to-kill ratio.

Commander Dudley Morton in USS Wahoo became one of the war’s most successful skippers in early 1943.

Yet, even he suffered Mark 14 failures.

During his third patrol in January 1943, Morton fired nine torpedoes at a convoy.

Four were duds and two ran beneath their targets.

Three hit and detonated only because Morton had manually adjusted his depth settings based on rumors spreading through the submarine force.

After the fleetwide corrections, Morton’s fourth patrol saw him sink nine ships with 24 torpedoes, a hit rate previously impossible.

His aggressive tactics combined with weapons that finally worked made him legendary.

Wahoo went down with all hands in October 1943.

But Morton’s success had already proven what American submarines could achieve with reliable torpedoes.

The corrected Mark14’s effectiveness was further demonstrated at the Battle of Lake Gulf in October 1944.

USS Darter and USS Dace ambushed a Japanese heavy cruiser squadron in the Palawan Passage before dawn.

Commander David Mcccleintok in Darter fired six torpedoes at the heavy cruiser Atago, flagship of Admiral Teo Karita from 980 yards.

Four struck home.

Itago capsized and sank in 18 minutes.

Admiral Kito was rescued from the water.

Minutes later, Dace fired four torpedoes at the heavy cruiser Maya.

All four hit.

Maya exploded and sank in 4 minutes.

These were capital ships deleted from the Japanese order of battle in under half an hour by weapons that two years earlier would likely have failed.

The psychological impact on Japanese naval command was severe.

Their heavy cruiser force could no longer operate without fear of submarine attack even in supposedly controlled waters.

The weapons design, once corrected, proved particularly effective against tankers, Japan’s critical vulnerability.

The empire depended entirely on imported petroleum and American submarines systematically destroyed this lifeline.

On November 21st, 1943, USS Celian, two under commander Eli Reich, intercepted the battleship Congo.

Reich fired six Mark1 14 from 3,000 yd.

Three struck Congo’s port side, flooding an engine room, igniting a fuel bunker, and blowing a 60 ft hole below the water line.

Congo listed heavily and slowed.

5 hours later, she capsized and sank, taking 1,250 men down.

Numsilian became the only American submarine to sink a battleship, a feat impossible with the defective pre-1943 torpedoes.

Japanese naval officers who survived submarine attacks reported dread of the later war American torpedo performance.

Interrogations after the war revealed that by 1944, merchant captains considered convoy duty a death sentence.

A tanker captain captured in 1944 told interrogators his crew had held a funeral ceremony before departing Singapore.

Certain they would be sunk, they were hit by three Mark1 14s from USS Rasher.

The tanker carrying 10,000 tons of crude oil burned for 6 hours before exploding.

Japanese escort commanders reported that American torpedoes, which had often malfunctioned to their benefit early in the war, now ran true and detonated with terrifying consistency.

One captured destroyer captain described the damage as instantaneous and catastrophic, vastly different from earlier attacks.

Yet, even the corrected Mark14 was not without limitations.

Its hastily redesigned contact pistol was more reliable, but still had occasional failures.

USS Tang’s final patrol in October 1944 ended in tragedy when her last torpedo malfunctioned.

The torpedo broached, curved left in a circular run, and struck Tang herself.

The explosion killed 78 men.

Commander Okaane and eight others survived to be captured.

Postwar analysis concluded the gyroscope failed due to battle damage to the torpedo tube mount.

The corrected pistol worked perfectly, detonating Tang’s own warhead against her hull.

Cold water in northern Pacific waters occasionally caused the alcohol-based propulsion to perform sluggishly, reducing range, and the weapons remained expensive and complicated.

each required hours of maintenance and precise handling as a single error could waste weeks of patrol.

The Mark1 14 remained in production through the war’s end.

By August 1945, approximately 14,000 had been manufactured.

Production peaked in 1944 at nearly 400 per month.

Every fleet submarine carried 24 torpedoes, a mix of Mark1 14s and the electric Mark1 18 introduced as a backup.

The final combat use occurred on August 14th, 1945 when USS Torsk fired two Mark1s at a Japanese coastal defense vessel.

Both hit and detonated, sinking the target in 3 minutes.

It was the last ship sunk by the US Navy in World War II, destroyed by a weapon that began the war as a catastrophic failure and ended it as one of the most effective deployed by any navy.

Postwar, the Mark1 14 remained in American inventory until the late 1950s, replaced by wireg guided and acoustic homing torpedoes.

Several Allied navies acquired surplus Mark14s.

Brazil, Argentina, Chile, the Netherlands, and Pakistan operated them on ex-American diesel submarines with some in service into the 1970s.

The weapon saw limited action in the Korean War where submarines conducted few torpedo attacks.

The last recorded combat firing occurred in 1968 when an Argentine submarine test fired a Mark1 14 during an exercise, a Cold War Curiosity designed to sink Imperial Japanese battleships.

Modern historical assessment of the Mark1 14 remains scathing regarding its development, but recognizes its combat effectiveness once corrected.

The Naval History and Heritage Command’s official analysis calls the torpedo scandal one of the most serious indictments of pre-war naval weapons development in American history.

Historians note that had the Mark1 14 worked properly from December 1941, Japanese merchant shipping losses in 1942 to 1943 would likely have doubled, potentially shortening the war.

The National WWI Museum displays a sectioned Mark1 14 explaining each failure point, the poorly designed depth mechanism, fragile magnetic exploder, and inadequate contact pistol, a lesson in how bureaucratic negligence endangered its own users.

Museums at Pearl Harbor and Mayor Island preserve Mark1 14 ES recovered from sunken submarines.

Silent testimony to weapons that failed the men who depended on them.

The scandal’s legacy extends beyond the weapon itself, but prompting fundamental reforms in naval weapons testing that require extensive live fire validation before deployment.

Modern torpedo development involves thousands of test shots, a direct reaction to the Mark1 14 debacle.

The incident is still taught at the Naval Academy as a case study in institutional failure, technological hubris, and the courage of junior officers who defied authority to fix systemic problems.

Veterans of the submarine service remained bitter.

Oral histories reveal they consistently identified the Mark14’s failures as the war’s most frustrating experience.

Worse than depth charging because it was preventable.

The irony is profound.

The weapon submariners feared more than Japanese depth charges became once corrected the instrument that destroyed Japan’s maritime logistics.

The Mark1 14 sank 1,400,000 tons of Japanese shipping between 1943 and 1945 from oil tankers to a battleship.

It severed the Empire’s oil supply, starved its industry, and isolated its garrisons.

The torpedo that represented criminal negligence in its deployment became the physical manifestation of American submarine dominance once crews, not bureaucrats, took control of its correction.

The Mark14’s legacy is dual, a cautionary tale of institutional failure and a weapon that, despite betraying those who wielded it, ultimately helped win the Pacific War.

The skippers who survived to see Japan surrender, knew both truths intimately.

Their weapon had nearly killed them through incompetence, then saved them through insubordinate correction, then won them the war through sheer destructive capability finally unleashed.